NEET
- Exam
- NEET
- Subject
- Physics
- Chapter
- Laws of Motion
NEET · Physics · Laws of Motion
Assertion : Friction opposes motion of a body. Reason : Static...
Assertion : Friction opposes motion of a body.
Reason : Static friction is self adjusting while kinetic friction is constant.
Options
- AIf both Assertion and Reason are correct and Reason is the correct explanation of Assertion
- BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- CIf Assertion is true but Reason is false
- DIf Assertion is false but Reason is true
Correct answer
D. If Assertion is false but Reason is true
Step-by-step solution
Check assertion
- Friction opposes relative motion or the tendency of relative motion at the contact, not "motion of a body" in every situation; for example, while walking, friction aids forward motion, so the blanket statement is false.
Check reason
- Static friction adjusts up to its limiting value to match the applied force, whereas kinetic friction is approximately constant during sliding, making the reason correct.